cmake does not produce relative paths in its generated make and
project files. There is an option CMAKE_USE_RELATIVE_PATHS which
appears to do this but the documentation says:
"""This option does not work for more complicated projects, and
relative paths are used when possible. In general, it is not possible
to move CMake generated makefiles to a different location regardless
of the value of this variable."""
This means that generated Visual Studio project files will not work
for other people unless a particular absolute build location is
specified for everyone which will not suit most. Each person that
wants to build Python will have to run cmake before starting Visual
Studio thus increasing the prerequisites.
Neil